Jisho

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しもばしら 霜柱
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Noun
1. frost columns; ice needles​
Wikipedia definition
2. Needle ice​Needle ice is a phenomenon that occurs when the temperature of the soil is above 0 °C (32 °F) and the surface temperature of the air is below 0 °C (32 °F). The subterranean liquid water is brought to the surface via capillary action, where it freezes and contributes to a growing needle-like ice column. The ice needles are typically a few centimetres long. While growing, they may lift or push away small soil particles.
Read “Needle ice” on English Wikipedia
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Read “Needle ice” on DBpedia

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